UPDATED May 5:
I apologize to the forum for mixing two different problems. They are unrelated.
Problem #1: User error. I thought I was using a class 6 SD card but I was wrong. The yellow "!" indicates a pathologically slow card. Upgrading to a class 10 resolved this problem.
Problem #2: UNRESOLVED. Red battery indicator comes on prematurely. On a fresh charge, it'll turn red after recording for a couple of minutes. On a partially drained battery, it turns red immediately upon entering movie mode or pressing the record button. Turn the camera off and then right back on in "still" mode and it shows full charge and works fine ... until trying to shoot video. I have not precisely measured recording times but it'll record for at least 20 (maybe 30?) minutes while flashing red.
Recall? Don't hold your breath. This camera has been discontinued and replaced by a new model (with its own problems). If you're thinking about buying this camera used or refurbished, DO NOT DO IT! Look back at all the complaints, and you'll see that Canon denied the problems with this camera from the very beginning, and never made things right with customers.
Hi all , I will test this idea. Buy Kit ACK-DC40, cheap AliExpress (U$S 12). From Kit use only false battery adapter and connector. Buy Flashlight + 18650 batteries (same voltage , technology, much more battery capacity than Canon original NB6L) + Charger (U$S 25) kit. Use the flashlight as battery holder with a cable plugged into the camera. Put the flashlight in your pocket and shoot many videos !!!
Just for information I suffered this problem, product was returned to Canon but got the standard "it's OK it meets the specification".
Well I bought a 3rd party mains adaptor used the battery adaptor supplied with this made a battery holder into a handle that screws in the base. The 2700mAh battery runs the video fine.
Achieved >50 minutes recording and still no battery issues, zooimng causes no problem either.
You will need to be keen to do this but if you get the right type of battery then you will be rewarded with an excellent HD video recorder.
Hope this helps anyone considering this way forward.